JPS59106939A - Reactive injection molding method - Google Patents
Reactive injection molding methodInfo
- Publication number
- JPS59106939A JPS59106939A JP57216651A JP21665182A JPS59106939A JP S59106939 A JPS59106939 A JP S59106939A JP 57216651 A JP57216651 A JP 57216651A JP 21665182 A JP21665182 A JP 21665182A JP S59106939 A JPS59106939 A JP S59106939A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- molding cavity
- mold
- compressed
- stock solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、金型の成形キャビティに液状プラスチックを
注入して所要形状の製品を得る反応射出成形方法に関し
、更に鮮しくは、上記成形キャビティ内の液状プラスチ
ックＣ以下原液という１の固化に伴う収縮を補正する反
応射出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reaction injection molding method for obtaining a product having a desired shape by injecting liquid plastic into a molding cavity of a mold, and more particularly, the present invention relates to a reaction injection molding method for obtaining a product having a desired shape by injecting liquid plastic into a molding cavity of a mold, and more particularly relates to a reaction injection molding method for injecting a liquid plastic into a molding cavity of a mold to obtain a product having a desired shape. The present invention relates to a reaction injection molding method for correcting shrinkage due to solidification.
一般に、反応射出成形を行うには、高圧で衝突混合させ
た複数の原液を金型内に注入するとともに、原液の重合
反応により合成樹脂を生成して固化させるといった方法
がとられている。In general, reaction injection molding is performed by injecting a plurality of stock solutions that have been collided and mixed under high pressure into a mold, and then producing and solidifying a synthetic resin through a polymerization reaction of the stock solutions.
ところで、上記原液には、一般的にポリウレタンのよう
に、発泡剤を入れて使用するものと、ナイロン等のよう
に発泡剤を入れずに使用するものとがあり、ナイロンの
ように一般的に発泡剤を入れずに使用する原液において
は、原液の重合反応時に収縮を起こす。By the way, the above-mentioned stock solutions generally include those that are used with a foaming agent, such as polyurethane, and those that are used without a foaming agent, such as nylon. When the stock solution is used without a blowing agent, shrinkage occurs during the polymerization reaction of the stock solution.
このため、従来の反応射出成形方法において。Therefore, in the conventional reaction injection molding method.
ナイロンのような発泡剤を入れずに使用する原液を用い
ると、原液の重合反応時における収縮に起因して、原液
が固化に伴って収縮するため、成形品表面にひけを生じ
たり、表面がでこぼこにかるなどの問題があった。If you use a stock solution without a foaming agent such as nylon, the stock solution will shrink as it solidifies due to shrinkage during the polymerization reaction, which may cause sink marks on the surface of the molded product or cause the surface to become rough. There were problems such as uneven surfaces.
そこで本出願人は特ＪｌｉｌｌＢ５７−８５５１２号明
細書において、第１図に示すような成形キャビティ１に
連通し几液溜り２を有する金型Ａを用い。Therefore, in the specification of Japanese Patent Application No. Jlill B57-85512, the present applicant used a mold A having a liquid reservoir 2 communicating with a molding cavity 1 as shown in FIG.
」：記成形キャビティ１と液溜り２に原液を注入した後
、原液が流動性を有する間に、液溜り：２１内の原液を
加圧し一成形キャビテイ１内の原液の固化に伴う収縮を
補正するといった方法を発明した。After injecting the stock solution into the molding cavity 1 and the liquid reservoir 2, while the stock solution has fluidity, the stock solution in the liquid pool 21 is pressurized to compensate for the shrinkage caused by solidification of the stock solution in the molding cavity 1. He invented a method to do so.
ここで上記加圧による補正には液溜り２に連通するシ１
１ンダ等の補正機構Ｂが使用されるようになっている。Here, for correction by the above-mentioned pressurization, the cylinder 1 communicating with the liquid reservoir 2 is
A correction mechanism B such as a first-order type is now used.
ところで上記し九発明の方法によれば、成形品のひけや
でとぼとを充分に解消できるものの、金型外にシリンダ
等の補正機構Ｂを設ける必要が生じて装置全体が複雑化
するため機械的トラブルが生じ易いといった不満を生じ
ることがわかった。By the way, according to the method of the ninth invention described above, although it is possible to sufficiently eliminate sink marks and spots on the molded product, it becomes necessary to provide a correction mechanism B such as a cylinder outside the mold, which complicates the entire apparatus. It was found that this resulted in complaints that mechanical troubles were likely to occur.
また、補正機−Ｂを金型に取り付はる関係上、装置全体
が高価になるとと本に大きな設置スペースが必要になる
といった問題もある。さらに、原液の固化以前に行う補
正機構Ｂの作動タイミングのとり方が難かしいといつｔ
問題もある。Furthermore, since the corrector-B is attached to the mold, there is a problem that the entire device becomes expensive and a large installation space is required. Furthermore, it is difficult to time the operation of correction mechanism B before solidification of the stock solution.
There are also problems.
この発明は以上のようか背景に鑑みてなされ友もので、
成形キャビティに開口する液溜り全盲する金型を用い、
成形キャビティと、液溜りとに対する原液の注入により
生じる圧縮封入空気の圧力を利用して成形キャビティ内
の原液の固化に伴う収縮を補正することによって、装置
を複雑化したり高価にすることなく成形品表面の仕上り
状態を良好にすることができる反応射出成形方法を提供
することを目的とする。This invention was made in view of the above background,
Using a mold that completely blinds the liquid pool that opens into the molding cavity,
By using the pressure of the compressed sealed air generated by injecting the stock solution into the mold cavity and the liquid reservoir to compensate for the shrinkage caused by the solidification of the stock solution in the mold cavity, the molded product can be manufactured without complicating or expensive equipment. It is an object of the present invention to provide a reaction injection molding method that can improve the surface finish.
以下この発明を図面を参照して説明する。The present invention will be explained below with reference to the drawings.
第２図は本発明の実施に使用する反応射出成形装置の一
例を示すもので、１０け複数の原液の衝突混合やその停
止をなす混合ヘッドを示し、１１は混合ヘッド１０に連
絡され元金型を示す。上記金型１１は、合わせ面ｆｌａ
ｔ−有する上型１１ｂと合わせ面ｌｉｅを有する下Ｗｉ
ｌｄとを両合わせ面１１ａ、ｌｌｂを密接させて構成さ
れ、上紐１１ｂの合わせ面１１＆中央に形成された凹部
ｌｉｅと下型ｌｉｄの合わせ面１１ｃ中夫に形成され几
凹部１１ｆとを合わせて成形キャビティ１１ｇが形成さ
れている。この成形キャビティ１１ｇの一端ｆ注入口１
１ ｇ、１には混合ヘッド１０が連絡されるとともに他
端には上型１１ｂの混合ヘット０取付側と反対側に形成
された液溜り１２が連絡されている。この液溜＃）１２
は成形キャビティｌ１ｇの上記他端と上型１１ｂの混合
ヘッド取付側と反対側の端部との間に形成された縦断面
台形状のもので、その高さは成形キャビティ１１ｇの高
さＨ（第２図にＨで示す）よりも高くなっていて、上Ｗ
ｌｌｂの合わせ面１１ａに形成された連通溝１１ｈによ
って成形キャビティｌ１ｇに連絡されている。FIG. 2 shows an example of a reaction injection molding apparatus used in the practice of the present invention, and shows a mixing head that collides and mixes ten or more raw solutions and stops the collision, and numeral 11 is connected to the mixing head 10, and the principal liquid is Show type. The mold 11 has a mating surface fla
The upper die 11b having the t- and the lower Wi having the mating surface lie
ld and the mating surfaces 11a and llb are brought into close contact with each other, and the recess lie formed in the mating surface 11¢er of the upper string 11b and the recess 11f formed in the middle of the mating surface 11c of the lower mold lid are aligned. A molding cavity 11g is formed. One end of this molding cavity 11g f injection port 1
A mixing head 10 is connected to 1g and 1, and a liquid reservoir 12 formed on the opposite side of the upper die 11b to the side where the mixing head 0 is attached is connected to the other end. This liquid reservoir #)12
has a trapezoidal longitudinal section formed between the other end of the molding cavity l1g and the end of the upper mold 11b opposite to the side where the mixing head is attached, and its height is equal to the height H ( (shown with H in Figure 2), and is higher than the upper W
It is connected to the molding cavity l1g by a communication groove 11h formed in the mating surface 11a of the llb.
なお、図中１３は、合わせ面１１ａと合わせ面１１ｃと
に挾まれて設けられ成形キャビティｌ１ｇ内と連通溝１
１ｈ内と液溜シ１２内の各々の空気の合わせ面１１ａ、
１１ｅからのもれを防ぐシール材、Ｇは成形キャビティ
ｌ１ｇと連通溝１１ｈと液溜シ１２とに注入された原液
を示す。In addition, 13 in the figure is provided between the mating surface 11a and the mating surface 11c, and is provided between the inside of the molding cavity l1g and the communication groove 1.
1h and the air matching surface 11a in the liquid reservoir 12,
A sealing material for preventing leakage from the molding cavity 11e, G indicates the stock solution injected into the molding cavity 11g, the communication groove 11h, and the liquid reservoir 12.
次にｗｔ２図に示す装置によってこの発明の方法を実施
する場合について説明する。Next, a case will be described in which the method of the present invention is implemented using the apparatus shown in Fig. wt2.
まず、混合ヘッド１０によって周知のように複数の原液
を混合し、次いで注入口１１ ｇ、、から原液Ｇｆｔ液
溜り１２に半分傭人いるまで注入する。First, a plurality of stock solutions are mixed by the mixing head 10 as is well known, and then the stock solution is injected from the injection port 11g until half of the stock solution Gft is in the reservoir 12.
ここで成形キャビティｌ１ｇと連通溝１１ｈと液溜り１
２の下部に入ってい几空気は原液Ｇの注入に従って徐々
に圧縮され液溜１２の上部に圧縮封入される。つまりこ
の圧縮封入空気が原液Ｇを加圧しｔまま原液Ｇけ固化を
開始する。し九がって原液Ｇが収縮して成形キャビティ
内に空間が生じようとしても上記圧縮封入空気の圧力に
押される原液によってつぶされるため成形品の表面にヒ
ケやでこぼこは生じない。すなわちｍ２図に示す装置を
用いて上記のように成形を行うと、金型に機械的補正機
構等を従来のように設けなくとも成形品にひけやでこぼ
こが生じない。たお、液溜シは金Ｗｌｌの内部にあり、
金型１１け従来の補正機構を取り付は友金匿のように大
部化しないｔめ省スペースである。さらに従来方法では
難題であり几補正機構の作Ｉｌ］４イミングを合わせる
という問題は生じることがなく、原液Ｇを注入口１１ｇ
１、から注入するのみで収縮補正ができるため、操作も
容易である。ま友、原液の固化によって原液内に真空気
泡が生じても、この真空気泡は上記圧縮封入空気の圧力
によってつぶされ、補正される。Here, the molding cavity l1g, the communication groove 11h and the liquid reservoir 1
The air entering the lower part of the liquid reservoir 12 is gradually compressed as the stock solution G is injected, and is compressed and sealed in the upper part of the liquid reservoir 12. In other words, this compressed sealed air pressurizes the stock solution G, and solidification of the stock solution G starts. Even if the stock solution G contracts and creates a space in the molding cavity, it will be crushed by the stock solution pushed by the pressure of the compressed air, and no sink marks or unevenness will occur on the surface of the molded product. That is, when molding is performed as described above using the apparatus shown in Fig. m2, sink marks and unevenness do not occur in the molded product even if the mold is not provided with a mechanical correction mechanism or the like as in the conventional method. Tao, the liquid reservoir is inside the metal wall,
The installation of the conventional correction mechanism of 11 molds is space-saving as it does not have to be bulky like the Tomokin Haku. Furthermore, the problem of adjusting the timing of the correction mechanism, which is a difficult problem with the conventional method, does not occur, and the stock solution G is injected into the injection port 11g.
It is easy to operate because contraction correction can be performed by simply injecting from step 1. Even if vacuum bubbles are generated in the stock solution due to solidification of the stock solution, the vacuum bubbles are collapsed and corrected by the pressure of the compressed sealed air.
なお、圧縮気体により原液に加わる圧力は、液溜り１２
内に注入する原液量の大小によって自由にコントロール
可能である。Note that the pressure applied to the stock solution by compressed gas is
It can be freely controlled by adjusting the amount of stock solution injected into the tube.
一方、連通溝１１ｈと液溜９１２内で固化した部分は金
型１１から成形品を取り外した後に成形品から切り離し
て廃棄する。On the other hand, after the molded product is removed from the mold 11, the solidified portions in the communication groove 11h and the liquid reservoir 912 are separated from the molded product and discarded.
なおま几、液溜り１２は下Ｍｌ １ ｄに形成してもよ
いし１上型１１ｂと下型ｌｉｄの両刀に形成してもよい
。The liquid reservoir 12 may be formed in the lower Ml 1 d, or may be formed in both the upper mold 11b and the lower mold lid.
以上説明したようにこの発明は、成形キャビティに開口
する液溜り【有する金型を用い、成形キャビティに注入
する原液の注入によシ成形キャビティ内の空気を液溜り
内に圧縮封入し、この圧縮封入した空気の圧力によって
原液を加圧して原液の固化収縮を補正するものであるか
ら、金型に補正機構を取り付けて固化収縮を補正する方
法のように装置が大型化したり一補正機構の機械的トラ
ブルを生じたり、補正機構の作動タイミングに注意する
といつｔ問題を生じることなく、成形品表面のひ叶やで
こぼこをなくすることができる。また金型に特別な機構
を＠シ付ける必要がないため、装置自体も安価になり、
操作も容品である。As explained above, the present invention uses a mold having a liquid reservoir opening into the molding cavity, compresses and encapsulates the air in the molding cavity into the liquid reservoir by injecting the stock solution into the molding cavity, and compresses the air inside the molding cavity into the liquid reservoir. Since this method corrects the solidification shrinkage of the stock solution by pressurizing the stock solution using the pressure of the enclosed air, the equipment becomes large and the machine with only one correction mechanism is required. By paying attention to the timing of the operation of the correction mechanism, it is possible to eliminate ridges and unevenness on the surface of the molded product without causing problems. Also, since there is no need to attach a special mechanism to the mold, the equipment itself becomes cheaper.
It is also easy to operate.
第１図は従来の反応射出成形方法に使用される金型の一
例を示す断面略図、第２図はこの発明の方法に用いる反
応射出成形装置の一例を示す断面略図である。
１１・・・・・・金ＴＪ１％１１ｇ・・・・・・成形キ
ャビティ、１２・・・・・・液溜り、Ｇ・・・・・・液
状プラスチックＣ原液）。
出願人 株式会社 新潟鉄工所FIG. 1 is a schematic cross-sectional view showing an example of a mold used in a conventional reaction injection molding method, and FIG. 2 is a schematic cross-sectional view showing an example of a reaction injection molding apparatus used in the method of the present invention. 11...Gold TJ1% 11g...Molding cavity, 12...Liquid pool, G...Liquid plastic C stock solution). Applicant Niigata Iron Works Co., Ltd.
Claims (1)
要形状の製品を得る反応射出成形方法において、上記成
形キャビティに連通ずる液溜りを有する金型を用いると
ともに、成形キャビティと液溜りとに対する液状プラス
チックの注入によって成形キャビティ内と液溜り内の空
気を液溜りの一部に圧縮封入し、この圧縮封入空気の圧
力によって成形キャビティに注入され九液状プラスチッ
クを加圧して成形キャビティ内の液状プラスチックの固
化に伴う収縮を補正することを特徴とする反応射出成形
方法。In a reaction injection molding method in which a product having a desired shape is obtained by injecting liquid plastic into a molding cavity of a mold, a mold having a liquid reservoir communicating with the molding cavity is used, and the liquid plastic is injected into the molding cavity and the liquid reservoir. By injection, the air inside the molding cavity and the liquid pool is compressed and sealed into a part of the liquid pool, and the pressure of this compressed air is injected into the molding cavity, pressurizing the liquid plastic, and solidifying the liquid plastic inside the molding cavity. A reaction injection molding method characterized by compensating for accompanying shrinkage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216651A JPS59106939A (en) | 1982-12-10 | 1982-12-10 | Reactive injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216651A JPS59106939A (en) | 1982-12-10 | 1982-12-10 | Reactive injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59106939A true JPS59106939A (en) | 1984-06-20 |
| JPS6110286B2 JPS6110286B2 (en) | 1986-03-28 |
Family
ID=16691785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57216651A Granted JPS59106939A (en) | 1982-12-10 | 1982-12-10 | Reactive injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59106939A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014156115A (en) * | 2013-01-16 | 2014-08-28 | Toray Ind Inc | Method of producing fiber-reinforced resin |
-
1982
- 1982-12-10 JP JP57216651A patent/JPS59106939A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014156115A (en) * | 2013-01-16 | 2014-08-28 | Toray Ind Inc | Method of producing fiber-reinforced resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6110286B2 (en) | 1986-03-28 |
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